Weighing scale



Maly- 15, 192s. 1;669,21'28 T. H. STRACHAN NEIGHING SCALE Original FiledAu2;.1, 1925 2 Sheets-Sheet 1 Fyj. 125

ZEW CAMPI- my JA Catton/w94 mypw @www May 15, 1928. 1,669,428

T. H. STRACHAN WEIGHING SCALE Original Filed Aug. 1, 1925- 2Sheets-Sheet 2 l 75 50 Svwamtoz v l-/` @Mam @5% A @IHM/mmf PatentedMay-15, 1928.

i l UNITED: STATES THOMAS HENRY `SIBAGIIN, OF DAYTON,

OHIO, ASSIGNOR TO DAYTON SCALE COI? PANY, OF DAYTON," OHIO, CORPORATIONNEW JERSEY.'

WEIGBING SCALE.

originai'appueatma mea August 1, 1925, serial No. 41,472. rivm-.aandthis appncamnjniea April. u,

1926.A Serial This invention pertains to Weighi'ngscales, being adivision of my ycopending yappllcation Serial No.47,4172, liledAugustl,1925, and comprisesimproveinents in details -of drums used in certaintypes of computing scales. y,

A .drum computing scale `is provided with 'a rotatable charty bearin kaplurality of columns of values' compute' according to prices 'appearingon a fixed plate` or bar extending acrossthe 'drinn adjzmentA the chart`Each column of values on the chart correspondsto lone ofthe prices onthe price bar, or"pr1ce range, as it is usuallycalled.

" Itis desirable to have as 'large'an assortment of pricesand:correspondingcolumns of values as possible, but their number isklimited by the. Widthof the chart.

' It is notl practical to increaseqthe number 2Why? reducingpthe sizeofthe printed characters on the drumabecause they must be kept largeenoughtolbe easily readable. It has been suggestedy that the drum mayibemade asy Wide as desiredv andv the enclosing 25." casing be made aslargeas maybe necessary 'in order toA enclose the enlargeddrum. 'Such asolution is impractical forvarious reasons. In the'iirst place, the`drum andcasing are already as long asgis practical to accommo- 'date oncounters :Where .the scales are used,

lortomanufacture economically.V In the second p'lace,`the weight of thechartstructure must bevkept'as lightfas possible, forif increasedbeyonda certain pointthe laccuracy of the scale becomes so impaired as torender ituseless'as afcommercial Weighing instrument. y f

Thel .principaL object of this invention is to providea Wider chartwithout increas- 40 ingfthe outside dimensions of the drum and without'Vappreciably vincreasing the Weight ofthe chart;r` y i Another object isto provide improved ad justing devices for the indicator Wire that `islprovidedindrurn scales, to aidtheoperatorinj properly reading Weightsand values.

In the drawings, y p n y Fig: 1 is a vfront view of a drum scale v withouter casing removed, showing chart,

end castings,price rangeyreading Wire, etc.

' i Fig. 2is an end view of ig.y 1.

Fig. 3 is an enlarged'vsectional View of details ofthe' drum operatingmechanism.

Figs. 4, 5 and 'are enlarged detail views of the (wire adjustingdevices.

rlhe scale comprises,` in general, a base 50, on which is fulcrumedabase lever 7 5 which supports in the well knownmanner aplatform 92. A

' yThe `freeend of lever 75 is connected by steel-yard rod 101 and zeroadjusting device "1031to equalizerbar 109 and draw bar y '111, whichinfturn are connected' to racks 117y andsprings 113 respectively, therebeing exactly duplicate mechanisms at both ends ofthe machine.` I

Mounted rigidly at each end of the drum portion of'thescale is an endcasting 72,

which provides,-through bossill, support fora bearing 132 in vvhich'rotates the end of chart Shaft 128.

The chart itself, in its best form, consists of'agpaper. cylinder 126fittedr around alu minumspiders 127,Whicharefast to shaft 128. Near eachend' of shaft 128 is a pinion 130, enineshed Withk rack 117 so as to berotated therebywhen rack 117 moves vertically in `response'tomovernentsof platform `92. The upper end of'spring 113 is secured byscrerv 120to atemperature-compensating member 121. Asload is applied tothe scaleplatform springs 113 are extended, thereby lowering bars 109`and 111,Racks 117 are `also lowered and rotate the chart 126 `to a positioncorresponding tothe load on.k the platform.

i It has been Vcustomary in the past to make the castinos 72 of uniformdiameter throughout "their axial length. that diameter being vsuch aslto accommodatethe drum Casing which encloses the chart.

Forfthe purpose of my invention-I reduce the diameter of the innerlpOrtionV of the casting, as indicated at 125, to adimension less "thanthe diameter of the chart, `and `Widenthechart" to Aoverlap the reducedportion 125,0f`the casting as shown in Fig. 3.

The end spider 127 has a deep fiange i129,y

and chart 126 extends to theL outer edge of iiange'1`29, thus increasingthe Width ofthe chart at each end by an amount substantially equal: tothedepth of flange 129, thus prostem of screw 142a.

viding room for several additional columns of figures on the chartwithout increasing the over-all width of the machine. Since shaft 128 isnot increased in length, there is very slight increase in weight of thechart assembly, the additional 'material being only the paper and thinsheet aluminum addedv y n Y ing drum having a supporting shaft, means tothe length of the chart.

I am aware that previous constructions have shown charts overlapping theend castings, but only when the drum shaft was driven at or near itscenter instead of at its ends as in the present design. 1n such previousconstructions the problem was comparatively simple, as there was nonecessity of providing accommodations for springs,

racks, pinions, etc., Within the ends of the drum, as in the presentdesign, in which,l as will be noted, rack bars 115 are offset from racks117 in order to get around thel ends of the chart.

As shown in Fig. 1, chart 126 is marked with columns of graduatedWeights and values. In the drawing the value columns are indicated byvertical lilies with only a few `scattered figures to showwheretlieybelong. f y .A

Across the front of the machine, adjacent the chart, is a price plate155 bearing prices 157, therebeing one price for each chart column.Slightly above the row of prices is the fixed reading wire 143. Wire 143must be accurately positioned with reference to the chart and pricerange, therefore it requires adjustment in and out, up and down, andalso for tension. All these adjustments are provided in the improveddevice which will now be described.

Each end casting 72 has a flat yboss140a (Figs. 4, 5 and 6). Threadedinto boss 140211 is a screw 1423*. Wire 143 passes over a notch 144 inthe L-shaped member 145 and issecured thereto by a screw 146. Member145is longitudinally slotted at 147 to receive the Another screw 148 isthreaded into 145. As shown in Figs.; 4 and 5 the bent portion 149 ofmember 145 is provided with sharp corners which bearupon the surface ofboss 140. By loosening screws 148 and 142a the bracket 145 Lmay bemoved, thereby permitting the adjustment of wire 143 in or out or up vordown, as desired.` After ythe adjustment is secured theadjustnient maybelocked by tightening screws 142?. Tension in wire 143 may be regulatedby turning screw 148 .in or out.

As shown in Fig. 2, wire 143 passes through notches 260 in end castings72. Thus the reading wire is radially within the periphery of castings72. This construction enables the drum casing parts to be assembledwhile the reading wire is in position without liability of the wirebeing moved from its adjusted position. Also, adjustment or replacementof a reading' wire may be effected from the outside of the end castingsas the bosses 140a are on the outer surfaces of the castings, andnotches 260 permit the wire to be passed through the end castings 72.

I claim- 1. Aweigliing scaloincluding an indicating pinions on saidshaft-and racks cooperatingwith said pinions, and shaft supporb ingmembers adjacent the ends thereof, said drum overlapping said supportingmembers whereby the length of saidzshaft may-be minimized, ,l ,y

In `a weighing scale of the. drum type having endcastings to'support anindicating drum, a reading wire extending across the drum from one Nendcasting to the other, fastening devices to whichthe ends of said Wireare attached, and means for supporting said reading wireffastening`devices upon the outf. ver end faces of theend castings to provideaccessibility thereto for adjustment and inspection at'points entirelyyoutside the ends of the end castings. said fastening devicesvbeingmovablerelatively to said end castings to provide 4adjustments ofsaid Wire vertically, horizontally laiidfor tension. .e 3. In acomputingvscale having a rela tively movable chart and a reading wirekindex therefor, means for supporting said.;

reading wire, saidmeans having provisions .for permitting up and downand in and out adjustment of the location of the reading wire .andsupplemental means for adjusting the ytautness ofthe reading wire to thedesired extent after` the other adjustmentshave been secured.

4. A reading wire supporting means and fastening device, saidmeanscomprising a clip` having a slottherein, ya screw threaded.`

into. aiixed part and passingl freely through saidslot, and secondscre'wythreaded into said clip and abutting against a fixed part.

5. The invention set forth in claim 4 in portionadapted to also bearupon the fixed part. f

6.V Al weighing scale comprising an indicating drum, a drum shaft, meansfor drivnvhich the clip is provided with a projecting` ing said shaftatits ends,y anda pairof frame members rotatably supporting said shaft,the ends of said drum .overlapping said frame members whereby a'greaterdrum length may be secured with'a minimum length of drumshaft and -witha minimum listance between the points of supportthere- 7. A weighingscale comprising an indithe same, means forkdri'ving said shaft at.`

both its endssaid means including pinions on said shaft and rackscooperating with said pinions, and frame members for rotatablysupporting said shaft, said frame members extending Within said drum. toprovide for maximum length of the drum and for a shorter distancebetween the points of support of said drum shaft.

8. A weighing scale having in combination, a drum shaftg means fordriving saidshaft at its ends, a pair of end castings provided withbosses supporting said shaft, and a drum carried by said shaft, saiddrum overlapping portions of said end castings lthereby affordingmaximum drum length with minimum length of the drum shaft.

, 9. A Weighing scale having an indicating drum and a shaft therefor,pinions upon said shaft substantially upon the ends thereof, a pair ofend castings, bearings for said shaft carried by said end castings anddis posed outside of the aforesaid pinions, saidk drum at its endsoverlapping said end castings5rracks meshing with said pinions andoperating members for saidl racks having offset portions to theindicating drum.

10. An indicating device for a Weighing scale,- comprising incombination, admin, a shaft on which saidvdrum is mounted,` and meanscomprising a rack and a pinion at each end of said shaftfor causing itsrotation, the end of said drum extending axially beyond said means. i

In testimony whereof I hereto yaffix my signature.

THOMAS HENRY sTnAcHAN.

pass outside the ends of

